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Finding the Fourth Proportional to 91,201.81, 136,823.79 and 28,872.31

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Solution

The fourth proportional to 91,201.81, 136,823.79 and 28,872.31 is: 43,315.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,201.81 : 136,823.79 = 28,872.31 : x
  2. Step 2: Convert to fraction form
    91,201.81/136,823.79 = 28,872.31/x
  3. Step 3: Cross multiply
    91,201.81x = 136,823.79 × 28,872.31
  4. Step 4: Simplify right side
    91,201.81x = 3,950,418,880.25
  5. Step 5: Solve for x
    x = 3,950,418,880.25/91,201.81
  6. Step 6: Final answer
    x = 43,315.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.